Ship



R. OGAWA.

Patented Nov. 2, 1920.

2 SHEETS-SHEET I.

R. OGAWA.

SHIP.

Al't'LlCATION FILED OCT. 9. I919.

Patented Nov. 2, 1920.

2 SHEETS-SHEET 2.

anucufog RIOHEI OG'AWjA, 0F TOKYO, JAPAN.

srurl Specification of Jietters Patent.

PatentedNov. 2, 1920.

Application filed-October 9, 1919. Serial-No. 329,579.

T 0 all to 710m it may concern I Be it known that I, Rronnr ()GAWA,subject of the Emperorof Japan residing at No. 22 Tatsuokacho, Hongoku,Tokyo, Japan, have invented certain new and useful Improvements inShips, of whichthe following is a specification.

This invention relates to improvements 1n ships and more particularly tomeans for reinforcing the sides of ships hulls.

In building wooden ships and the like, hold beams are employed in thehull for the purpose of reinforcin the interior and spacing the sidesapart. lhese hold beams take up considerable space which might beotherwise used for storing the cargo or locating the machinery. I

The object of the present invention 1s to provide a construction bywhich the hold beams may be dispensed with without affecting thestrength of the hull.

To this end, metal plates are arranged on the inner planking of the hullin a-linement with the transverse frames or ribs of the hull, and theseplates extend from deck to keel and are bolted in place by bolts whichpass through the outer planking, the transverse frames, the innerplanking and the metal plates.

With the foregoing object outlined, and with other objects in view whichwill appear as the description proceeds, the invention consists in thenovel features hereinafter described in detail, illustrated in theaccompanying drawings and more particularly pointed out in the appendedclaims.

Referring to the drawings Figure l is a transverse sectional view of aportion of a ships hull showing my invention applied thereto.

Fig. 2 is a perspective view of a portion of the construction shown inFig. 1.

Fig.3 is a detailed sectional view on an enlarged scale.

Fig. i is a diagram showing the relative bending movements of a shipsside.

Tn the drawings the outer wooden planking of the ships hull is shown asextending longitudinally of the vertically arranged transverse woodenribs or frames, and located on the inner sides of the transverse framesare longitudinally extending wooden inner planking.

The construction so far described is that oftlre ordinaryship and thesides are usually reinforced by the inner hold beams. In order, however,to eliminate the hold beams and at the same time to secure the necessarystability, T have provided metal reinforce ments 1 which are arranged inalinement with the transverse ribs and extend from the deck to the keel.

These metal reinforcements are in the form of flat straps which lieflush with the inner planking and rest at points on vertical innerlinings 3. The metal straps forming the reinforcements have their endsconnected together as shown at 2, so that they may be convenientlyfitted to the sides of the ship. The end straps at the keel and deck areangularly bent as shown to pro vide knees which engage said keel anddeck. lVith the foregoing construction internal forces exerted by theweight of the cargo and machinery 'ill not be directly transmitted tothe transverse frames or ribs and the ship planking and external forcescaused by the water will not affect the transverse frames and planking.

A ship s hull is ordinarily subjected to the following forces, first,the lateral pressure of the water; second, the lateral pressure of thecargo; third, the vertical pressure of the water; fourth, the verticalpressure of the cargo; fifth, the lateral forces arising throughrocking, and sixth, the lateral forces arising from waves dashing overthe ships sides.

In View of the forces exerted on the hull it is necessary for the sakeof safety to have some form of internal reinforcements. This I haveendeavored to provide without decreasing the cargo space.

In the diagram shown by Fig. 4 the, bending movements caused by externalforcesis shown diagrannnatrcally, and it will be seen that these bendingmovements are of gradually increasing curvature. In the diagram thecurve a (Z shows the gradually increasing bending movements at the topside of the hull, the curve Z) (Z shows the bending movement at themiddle; the curve 6 (Z shows the bending movement at the bottom bilge;the surve (3 shows the lateral forces at the beam end; and Z shows thedepth of the hold.

From the foregoing I believe that the con struction and advantages of myinvention will be readily understood and I am aware that changes may bemade in details Without departing from the spirit of the invention asset forth in the claims.

lVhat I claim and desire to secure by Letters Patent is:

1. In a ships hull the combination With the transverse Wooden frames,and inner and l outer longitudinal planking, of metallic reinforcementsfor the transverse frames laid inside the inner planking in line withthe transverse frames, and fastenings extending through the outerplanking, transverse frames, inner planking and metallic reinforcementsto hold the parts together, the reinforcements being extended from thekeel to the deck knee.

2. In a ships hull the cornbination with the transverse Wooden framesand inner and outer longitudinal planking, of metallic plates for thetransverse frames laid on the inner surface of the inner planking inline with the transverse frames and extending from keel to deck knee,and fastening bolts extending through the outer planking, trans-

